Hello there I have a Stanley Garage Door Opener 1805..43. I have 2-Clicker 123 remotes. One works fine but the other needs to be programed. Some instructions I found online indicate looking for "systems code switch positions" on "the motor unit receiver." I've looked everywhere on the remote and on the unit but to no avail. I do not have the original remote or the original owners manuals. Can anyone help me program my Clicker 123 ?